RF Calculator

 

calculator image

 

Input Radio Information


Radio System Frequency


MHz



Tx Radio Setting

Tx Power

dBm

Tx Antenna Gain

dBi

Tx Cable Loss

dB


Rx Radio Setting

Rx Sensitivity

dBm

Rx Antenna Gain

dBi

Rx Cable Loss

dB


Distance


km
 
 

 

Calculate Result

 

Distance

Fresnel Zone

Margin(dB)

Link Quality

Km m dB

 

 

Note:

 

  • 1. Free space loss = 32.44 + 20Log10(Frequency) + 20Log10(Distance in km)
  • 2. Margin= Tx System Total- FSL - RX System Total
  • 3. Miles to Kilometers = 1.609
  • 4. meters to feet = 3.28
  • 5. 1st Fresnel Zone radius (Km) = 17.3 x Sqr root ((Obstacle Distance x (Total Link - Obstacle Distance)) / (Frequency in GHz x Total Link))
  • 6. In this calculator we are using the right middle part of 1st Fresnel Zone radius.
  • 7. Antenna height must be more than 60% of the 1st fresnel zone
  • 8. Use Google chrome or you mobile browser, do not use Internet Explorer (won't output result).